Toy building block



FIG. 1 is a top perspective view of a toy building block showing my new design;

FIG. 2 is a bottom perspective view of the toy building block shown in FIG. 1;

FIG. 3 is a top view of the toy building block shown in FIG. 1;

FIG. 4 is a first side view of the toy building block shown in FIG. 1;

FIG. 5 is a second side view of the toy building block shown in FIG. 1;

FIG. 6 is a third side view of the toy building block shown in FIG. 1;

FIG. 7 is a fourth side view of the toy building block shown in FIG. 1; and,

FIG. 8 is a bottom view of the toy building block shown in FIG. 1.

The broken lines represent portions of the article that form no part of the claim. 

CLAIM The ornamental design for a toy building block, as shown and described. 